/*
 * Copyright (c) 2011 Imre Fazekas.
 * All rights reserved.
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer.
 *
 * Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 * Neither the name of the Brillien nor the names of its
 * terms and concepts may be used to endorse or promote products derived from this
 * software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

package com.vii.streamline.jsonrpc.exchange;

import com.vii.streamline.json.JsonRpcListener;
import com.vii.streamline.json.JsonRpcRequest;
import com.vii.streamline.json.JsonRpcResponse;
import com.vii.streamline.json.JsonRpcServices;
import com.vii.streamline.services.error.StreamLineException;
import com.vii.streamline.services.reflection.Invocation;
import org.slf4j.Logger;

import java.util.LinkedList;
import java.util.List;
import java.util.Map;

/**
 * Specialized {@JsonRpcListener} dealing with transport messages over JSON-RPC.
 */
public class ExchangeJsonRpcListener extends JsonRpcListener {

    protected ExchangeDataProvider        dataProvider;
    protected long                        expirationTime;

    protected ExchangeJsonRpcListener(boolean ssoRequired, ExchangeDataProvider dataProvider, long expirationTime, Logger logger) {
        super(ssoRequired, logger);
        this.dataProvider   = dataProvider;
        this.expirationTime = expirationTime;
    }

    protected boolean isJsonRpcTransportMessage(JsonRpcRequest request) {
        return request.getMethod().startsWith( ExchangeStatics.JSON_RPC_METHOD_PREFIX );
    }

    protected JsonRpcResponse processJsonRpcTransportPoll(JsonRpcRequest request) throws StreamLineException {
        String queuename = ((List)request.getParams()).get(0).toString();
        Map<Long,JsonRpcRequest> requests = dataProvider.getUndeliveredRequests( queuename, expirationTime );

        List<Map> result = new LinkedList<Map>();
        for( Long id : requests.keySet() ){
            JsonRpcRequest req = requests.get( id );
            result.add( (Map<String, Object>) ((List)req.getParams()).get(0) );
        }

        dataProvider.remove( queuename, requests.keySet() );

        return JsonRpcResponse.createResponse( request, result );
    }

    protected JsonRpcResponse processJsonRpcTransportCall(JsonRpcRequest request) throws StreamLineException {
        Map<String, Object> m = (Map<String, Object>) ((List)request.getParams()).get(0);
        dataProvider.store( m.get("recipient").toString(), request );
        return JsonRpcResponse.createResponse( request, "Done." );
    }

    protected JsonRpcResponse processJsonRpcTransportMessage(JsonRpcRequest request) {
        try{
            if( request.getMethod().endsWith( ExchangeStatics.JSON_RPC_METHOD_CALL_POSTFIX ) ){
                return processJsonRpcTransportCall(request);
            } else if( request.getMethod().endsWith( ExchangeStatics.JSON_RPC_METHOD_POLL_POSTFIX ) ){
                return processJsonRpcTransportPoll( request );
            }
            else
                return JsonRpcResponse.createResponse( request, JsonRpcServices.ERROR_METHOD_NOT_FOUND.getCode(), JsonRpcServices.ERROR_METHOD_NOT_FOUND.getMessage(), request.getMethod() );
        } catch (StreamLineException se){
            se.printStackTrace();
            return JsonRpcResponse.createResponse( request, JsonRpcServices.ERROR_SERVER_ERROR.getCode(), JsonRpcServices.ERROR_SERVER_ERROR.getMessage(), se.getMessage() );
        }
    }

    /**
     * Processes a simple JSON-RPC message.
     */
    protected JsonRpcResponse processSimpleRequest( JsonRpcRequest request ) {
        if (!request.isNotification()) {
            if( !isJsonRpcTransportMessage( request ) )
                return JsonRpcResponse.createResponse( request, JsonRpcServices.ERROR_INVALID_REQUEST.getCode(), JsonRpcServices.ERROR_INVALID_REQUEST.getMessage(), null );

            return processJsonRpcTransportMessage( request );
        }
        return null;
    }

    @Override
    public boolean isMethodReckognised( Invocation invocation ) {
        return false;
    }

    @Override
    public boolean hasMessageProcessorReturnValue( Invocation invocation ) throws StreamLineException{
        return false;
    }

    @Override
    public List<String> getParameterNames(Invocation invocation) throws StreamLineException {
        return null;
    }

    @Override
    public List<Class> getParameterTypes(Invocation invocation) throws StreamLineException {
        return null;
    }

    @Override
    public Map<String, Class> getParameterMap(Invocation invocation) throws StreamLineException {
        return null;
    }

    @Override
    protected JsonRpcResponse call(String sessionId, JsonRpcRequest typisedRequest) {
        return null;
    }

}
